J21.9
BillableAcute bronchiolitis, unspecified
J21.9 is the ICD-10-CM code for Acute bronchiolitis, unspecified. It is a billable, specific code valid for reimbursement.
J00-J99 Diseases of the respiratory system
Includes
- •Bronchiolitis (acute)
Excludes1 — not coded here
- •chronic bronchiolitis (J44.89)
Frequently asked questions
- What is ICD-10 code J21.9?
- J21.9 is the ICD-10-CM code for "Acute bronchiolitis, unspecified". It falls under J00-J99 Diseases of the respiratory system.
- Is J21.9 a billable code?
- Yes — J21.9 is a billable, specific ICD-10-CM code valid for reimbursement.
- What is excluded from J21.9?
- Excludes1 (not coded here): chronic bronchiolitis (J44.89).
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
Look up another ICD-10 code or condition